So, I don't know much about physics, nuclear energy and stuff beyond what popsci magazines show, but I've been reading about high temp superconductors, specifically REBCO tapes and how they seem promising. However, I then read about ARC, which is supposed to be a fusion reactor that uses the tech to manage plasmas for nuclear fusion.
However, I noticed that their website only says ARC will produce "plasmas which generate more energy than they consume, becoming the first net-energy fusion machine", yet they don't explain how, and apparently have not even tested the tech before...:
https://cfs.energy/technology/#sparc-fusion-energy-demonstration
Is this bullshit and a scam or something?

Pic unrelated.